.gitconfig for multiple clients / organizations

.gitconfig

# .gitconfig

[user]
        name = Name
        email = name@gmail.com
        username = primary-github-username
        signingKey = ~/.ssh/id_rsa.pub
[pull]
        ff = only
[commit]
        gpgsign = false
[core]
        editor = code --wait
        sshCommand = "ssh -i ~/.ssh/id_rsa.pub"
[gpg]
        format = ssh
[gpg "ssh"]
        allowedSignersFile = ~/.ssh/allowed_signers

## Client specific folders
[includeIf "gitdir:~/client-project/"]
        path = ~/client-project/.gitconfig

.secondary.gitconfig

# /client-project/.gitconfig
# Allows you to clone projects from another github account into the client-project folder

[user]
	name = Example
        email = name@example.com
	username = secondary-github-username
	signingKey = ~/.ssh/company_specific_ssh_key.pub
[pull]
	ff = only
[commit]
	gpgsign = true
[core]
	editor = code --wait
	sshCommand = "ssh -i ~/.ssh/company_specific_ssh_key.pub"

config

# ~/.ssh/config

Host example-org

    HostName github.com
    User git
    IdentityFile ~/.ssh/company_specific_ssh_key
    AddKeysToAgent yes

Host *

    AddKeysToAgent yes
    IdentityFile ~/.ssh/id_rsa